Looks a nice site with some good prices, my feedback would be I was unable to customise the lowset priced gaming PC, and within the customisation I was unable to remove elements. (For example I could not choose a system without a monitor)

I spoke with him this morning, he did say if you customise a performance PC to how you like it, you can do it so that you have the same / similar spec as a gaming PC, just with the option of no monitor.